相关疑难解决方法(0)

什么之间的区别INNER JOIN,LEFT JOIN,RIGHT JOIN并FULL JOIN 在MySQL的？

Table: FirstNames
NAME
    Tom
    Joe
    Peter

Table: FullNames
FULL_NAME:
    Tom Petty.
    Joe Satriani.
    Peter Griffin.
    Sarah Connor.

我想运行一个查询:

select * 
from FullNames where FULL_NAME like '%' || (select NAME from FirstNames) || '%'

它产生:

ORA-01427:单行子查询返回多行

这似乎是正确的.有没有办法在Oracle中做到这一点？

当我在远程数据库上尝试一些代码时，收到以下错误消息Postgres。

当数据帧位于本地时，以下伪复制代码可以很好地工作，但当它们很远时则不行。

library(tidyverse)
library(dbplyr)
library(RPostgres)


event <- tibble(id = c("00_1", "00_2", "00_3", "00_4", "00_5", "00_6", "00_7"),
               type_id = c("A", "B", "C", "B", "A", "B", "C"))


detail <- tibble(id = c(1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L),
                event_id = c("00_1", "00_1", "00_2", "00_2", "00_3", "00_4", "00_4", "00_5", "00_6", "00_6", "00_7", "00_8"),
                type_id = c(3L, 4L, 6L, 7L, 2L, 6L, 3L, 2L, 6L, 5L, 2L, 1L))


event_f <- event %>%
 mutate(new_variable = id %in% (detail …